Calibrator for board-to-board test probe

Abstract

The utility model discloses a calibrator for a board-to-board test probe. The calibrator comprises an external housing, a test assembly and a movable rear plug. A mounting chamber and a movable chamber are arranged in the outer shell; the test assembly comprises an outer conductor installed in the installation cavity, an inner conductor arranged in the outer conductor, and an insulating medium arranged between the two conductors and enabling the two conductors to be mutually kept. The movable rear plug is movably installed in the movable cavity and used for controlling electrical connection and disconnection between the inner conductor and the outer conductor. The calibrator for the board-to-board test probe provided by the utility model is simple and reliable in structure and convenient to operate, not only can be compatible with simultaneous calibration of a plurality of channels, but also can be freely switched between an open circuit device and a short circuit device without an external adapter and frequent plugging and unplugging, and can determine path attenuation through open circuit and short circuit measurement, thereby improving the test accuracy of the board-to-board test probe. And the absolute value of the transmission scattering parameter S21 of the board-to-board test probe can be calculated by combining the two kinds of measurement information, so that the aim of multiple times of calibration through one-time connection can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of calibration equipment, and in particular relates to a calibrator for a board-to-board test probe. Background Art

[0002] With the rapid development of the communications industry and the continuous upgrading of mobile phones, board-to-board RF connectors are widely used in new mobile phones. Testing is a crucial step in the production process. The test yield is also an important indicator of each company's production capacity. The board-to-board RF test probe is a special RF channel test probe for the new board-to-board connector. It is used to connect the board-to-board connector to be tested with the test instrument, detect the connection quality and stability of the board-to-board connector, and evaluate the impedance matching, signal loss and other performance of the board-to-board connector to help ensure the performance and reliability of the entire RF system.

[0003] The calibrator for board-to-board RF test probes is a device specifically used to calibrate board-to-board RF test probes to correct the errors of board-to-board RF test probes and ensure the accuracy and reliability of the test results of board-to-board RF test probes. However, due to the ultra-small pitch and multi-channel characteristics of board-to-board RF test probes, and the non-uniqueness of parameters such as the PIN position definition, PIN position spacing, and external dimensions of board-to-board connectors, each manufacturer has its own definition, and there is no universal calibration component on the market. The following steps need to be completed according to the conventional calibration method: 1. External adapter test head; 2. Add an adapter adapter connected to the calibration component to the adapter test head; 3. Complete the calibration of a single channel O / S / L in three steps; 4. Repeat steps 2 and 3 to complete the entire calibration. It can be seen that the above steps are not only cumbersome but also easy to miss, and consistency cannot be guaranteed. It is difficult to adapt to automated testing. After calibration, it is also difficult to eliminate the errors caused by the adapter test head and adapter adapter. Therefore, many mobile phone manufacturers choose not to calibrate the test, resulting in the board-to-board loss error being transferred to the entire RF circuit. If you want to ensure product performance and make the entire RF circuit meet the established indicators, you will have more stringent requirements on the indicators of other components, which will ultimately lead to an increase in the overall cost. Utility Model Content

[0004] The purpose of the utility model is to provide a calibrator for a board-to-board test probe, which is compatible with simultaneous calibration of multiple channels, does not require an external adapter, does not require frequent plugging and unplugging, and can complete calibration in only two steps, thereby ensuring calibration consistency and being suitable for automated testing.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A calibrator for a board-to-board test probe comprises an external shell, a test assembly and a movable back plug, wherein the external shell is provided with an installation chamber and a movable chamber; the test assembly comprises a hollow outer conductor, at least one inner conductor arranged in the outer conductor parallel to the axis of the outer conductor, and an insulating medium arranged between the two conductors to hold the two conductors to each other; wherein the installation portion of the outer conductor is embedded in the installation chamber; the docking portion of the outer conductor is exposed outside the external shell and is adapted to the shape of a connector to be tested; the movable back plug is movably installed in the movable chamber, and comprises a first contact portion capable of electrically contacting the outer conductor and a second contact portion capable of electrically contacting the inner conductor, the first contact portion being electrically connected to the second contact portion.

[0007] Furthermore, it also includes an insulating back plug arranged at the end of the mounting portion of the outer conductor for limiting the inner conductor, and the insulating back plug is provided with a conductive contact electrically connected to the inner conductor and protruding toward the active chamber.

[0008] Furthermore, the outer shell and the movable rear plug are both made of metal material, the movable rear plug is threadedly installed in the movable chamber, the first contact portion is the threaded surface of the movable rear plug, and the second contact portion is the end surface of the movable rear plug located in the movable chamber.

[0009] Furthermore, the outer shell and the main body of the movable rear plug are both made of insulating materials, the movable rear plug is threadedly installed in the movable chamber, and the first contact part and the second contact part are conductive metal sheets arranged on the end surface of the working end of the movable rear plug.

[0010] Furthermore, the outer shell and the main body of the movable rear plug are both made of insulation, the movable rear plug is slidably installed in the movable chamber, a limiting hole for controlling the position of the movable rear plug is opened on the side wall of the movable chamber, and a limiting pin matching the limiting hole is radially arranged on the side wall of the movable rear plug.

[0011] Furthermore, the insulating rear plug is fixedly connected to the outer conductor by a snap buckle, the conductive contact and the conductive spring are integrally formed on the insulating rear plug by an insert injection molding process, and the first contact portion and the second contact portion are conductive metal sheets arranged on the working end face of the movable rear plug.

[0012] Furthermore, the inner conductor is a spring probe, comprising a hollow main body and a floating part slidably installed in the main body through a spring.

[0013] Furthermore, a limit slot for controlling the floating height is provided on the outer wall of the floating part. Correspondingly, the insulating medium includes a first insulator, which is clamped between the floating part and the outer conductor through the limit slot. The inner diameter of the first insulator is larger than the outer diameter of the float at the limit slot, smaller than the outer diameter of the main body, and is in contact with the main body.

[0014] Furthermore, the insulating medium also includes a second insulator disposed below the first insulator, the second insulator is gap-matched with the floating portion, and abuts against a limiting ring on the inner side wall of the docking portion.

[0015] Furthermore, a limit platform is provided between the mounting portion and the docking portion of the outer conductor to ensure the installation depth of the outer conductor. A fixed base plate is provided on the outside of the outer shell, and fixing holes are provided on the fixed base plate to facilitate disassembly and assembly on the fixture.

[0016] Compared with the prior art, the beneficial technical effects are:

[0017] The calibrator for the board-to-board test probe provided by the utility model has a simple and reliable structure and is easy to operate. It is not only compatible with simultaneous calibration of multiple channels, but also does not require an external adapter. The calibration can be completed in two steps. It can switch freely between open circuits and short circuits without frequent plugging and unplugging. The path attenuation can be determined through open circuit and short circuit measurements. By combining the two types of measurement information, the absolute value of the transmission scattering parameter S21 of the board-to-board test probe can be calculated. In addition, by combining multiple open circuits or short circuits side by side to form an open circuit array or a short circuit array, the purpose of multiple calibrations can be achieved through one connection through channel switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 A schematic diagram of the overall structure of a calibrator for a board-to-board test probe provided in Embodiment 1 or 2 of the utility model;

[0020] Figure 2 A bottom view of a calibrator for a board-to-board test probe provided in Embodiment 1, 2 or 3 of the utility model;

[0021] Figure 3 An exploded view of a calibrator for a board-to-board test probe provided in Embodiment 1 of the utility model;

[0022] Figure 4A cross-sectional view of a calibrator for a board-to-board test probe provided in Embodiment 1 of the utility model along line BB;

[0023] Figure 5 A schematic diagram of the structure of an insulating rear plug in a calibrator for a board-to-board test probe provided in Embodiment 1 of the utility model;

[0024] Figure 6 This is an exploded view of a calibrator for a board-to-board test probe provided in Embodiment 2 of the present utility model.

[0025] Figure 7 A cross-sectional view of a calibrator for a board-to-board test probe along line AA provided in Embodiment 2 of the present utility model;

[0026] Figure 8 A schematic diagram of the structure of an insulating rear plug in a calibrator for a board-to-board test probe provided in Embodiment 2 of the present utility model;

[0027] Fig. 9 A schematic diagram of the overall structure of a calibrator for a board-to-board test probe provided in Embodiment 3 of the present utility model;

[0028] Fig.10 An exploded view of a calibrator for a board-to-board test probe provided in Embodiment 3 of the present utility model;

[0029] Fig.11 A cross-sectional view of a calibrator for a board-to-board test probe along line BB provided in Embodiment 3 of the present utility model;

[0030] Fig.12 This is a cross-sectional view along line AA of a calibrator for a board-to-board test probe provided in Embodiment 3 of the present utility model.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1-external shell, 101-installation chamber, 102-fixed bottom plate, 103-fixing hole, 104-movable chamber, 105-limiting hole, 2-outer conductor, 201-installation part, 202-docking part, 203-limiting platform, 204-limiting groove, 3-inner conductor, 301-main body, 302-floating part, 4-insulating medium, 401-first insulator, 402-second insulator, 5-insulating back plug, 501-fixed support arm, 502-limiting protrusion, 6-conductive contact, 7-movable back plug, 701-first contact part, 702-second contact part, 703-rotating handle, 704-marking line, 705-conductive metal sheet, 706-limiting pin, 8-conductive spring, 801-first elastic contact, 802 second elastic contact, 9-compression spring. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Embodiment 1:

[0035] like Figures 1 to 5 As shown, the embodiment of the utility model provides a calibrator for a board-to-board test probe, including an external shell 1, a test assembly, and a movable rear plug 7. A fixed bottom plate 102 is provided on the outside of the external shell 1, and a fixing hole 103 is provided on the fixed bottom plate 102 to facilitate disassembly and assembly on a fixture. The internal part of the external shell 1 is hollow, including an installation chamber 101 and an active chamber 104, for installation of the test assembly and the movable rear plug 7 respectively.

[0036] like Figure 3 and Figure 4 As shown, the test assembly includes an outer conductor 2, an inner conductor 3, an insulating medium 4 and an insulating back plug 5. The outer conductor 2 is a hollow structure, including a mounting portion 201 and a docking portion 202. The mounting portion 201 of the outer conductor 2 is interference-fitted with the mounting chamber 101 of the outer shell 1. Specifically, in this embodiment, the mounting portion 201 is embedded in the mounting chamber 101 by riveting. The shape of the docking portion 202 of the outer conductor 2 is adapted to the shape of the connector to be tested, and a limiting platform 203 is further provided between the mounting portion 201 and the docking portion 202 of the outer conductor 2. The limiting platform 203 can axially limit the installation depth of the mounting portion 201 when the outer conductor 2 is fixed by riveting, so as to ensure that the docking portion 202 of the outer conductor 2 is exposed outside the outer shell 1.

[0037] In this embodiment, there are multiple inner conductors 3, which are arranged in the outer conductor 2 parallel to the axis of the outer conductor 2. The inner conductor 3 is a spring probe, which includes a hollow main body 301 and a floating part 302 slidably installed in the main body 301 through a spring. The main body 301 is located in the mounting part 201 of the outer conductor 2, and the floating part 302 is located in the docking part 202 of the outer conductor 2, which is used to directly contact with the board-to-board RF test probe to ensure that multiple channels can be stably contacted, while avoiding the influence of inconsistent heights of probes of each channel of the board-to-board test probe on calibration.

[0038] The insulating medium 4 is arranged between the inner conductor 3 and the outer conductor 2, and can separate the inner conductor 3 from the outer conductor 2. Specifically, the insulating medium 4 includes a first insulator 401 and a second insulator 402. Correspondingly, a limit slot for controlling the floating height is provided on the outer wall of the floating part 302. The inner diameter of the first insulator 401 is larger than the outer diameter of the floating part at the limit slot, and smaller than the outer diameter of the main body 301. The first insulator 401 is arranged between the floating part 302 and the outer conductor 2 through the limit slot, and abuts against the main body 301 to axially limit the floating part 302. The second insulator 402 is arranged below the first insulator 401, and abuts against the limit ring on the inner wall of the docking part 202. The second insulator 402 is in clearance fit with the floating part 302. On the premise of ensuring that the floating part 302 can float normally, it can also provide guidance and protection for the floating part 302.

[0039] like Figure 4 and Figure 5 As shown, the insulating back plug 5 is fixed at the end of the mounting portion 201 of the outer conductor 2, and is used to separate the inner conductor 3 from the outer conductor 2. At the same time, by cooperating with the insulating medium 4, it plays a role in fixing the position of the inner conductor 3. During installation, it is only necessary to first insert the inner conductor 3 into the outer conductor 2 from the through hole of the mounting portion 201 end of the outer conductor 2 through the insulating medium 4, so that the insulating medium 4 abuts against the limit ring on the inner side wall of the docking portion 202, and then insert the insulating back plug 5 into the end of the mounting portion 201 of the outer conductor 2, so that the main body 301 of the inner conductor 3 can be fixed. The insulating back plug 5 is also fixed with a conductive contact 6 corresponding to the position of the inner conductor 3 by using an insert injection molding process. One end of the conductive contact 6 abuts against the end of the inner conductor 3, and the other end protrudes toward the active chamber 104 and is exposed on the outer end surface of the insulating back plug 5. Furthermore, in order to enable the insulating back plug 5 to fix the inner conductor 3 more firmly, the insulating back plug 5 is also provided with a fixing arm 501 that fits with the outer side wall of the outer conductor 2, and a hemispherical limiting protrusion 502 is provided on the inner side surface of the fixing arm 501, and a limiting groove 204 that cooperates with the limiting protrusion 502 is provided on the outer side wall of the outer conductor 2. When the outer conductor 2 is riveted into the outer shell 1, the limiting protrusion 502 will be tightly stuck in the limiting groove 204, thereby ensuring the firmness of the connection between the insulating back plug 5 and the outer conductor 2.

[0040] The movable rear plug 7 is movably installed in the movable chamber 104, and includes a first contact portion 701 capable of electrically contacting the outer conductor 2 and a second contact portion 702 capable of electrically contacting the inner conductor 3, wherein the first contact portion 701 is electrically connected to the second contact portion 702. The electrical connection and disconnection between the outer conductor 2 and the inner conductor 3 are controlled by adjusting the position of the movable rear plug 7. Thus, the calibrator can perform both open circuit detection and short circuit detection on the board-to-board RF test probe.

[0041] like Figure 4 As shown, in this embodiment, the outer shell 1 and the movable rear plug 7 are both made of metal materials. The movable rear plug 7 is threadedly installed in the movable chamber 104 of the outer shell 1. The first contact portion 701 is the threaded surface of the movable rear plug 7, which is in electrical contact with the outer conductor 2 through the outer shell 1. The second contact portion 702 is the end surface of the movable rear plug 7 located in the movable chamber 104. By twisting the handle 703 at the tail of the movable rear plug 7, the second contact portion 702 of the movable rear plug 7 can be moved up and down along the axis in the movable chamber 104. When the second contact portion 702 moves downward to the lowest end and tightly abuts against the conductive contact 6, the outer conductor 2 and the inner conductor 3 can be electrically connected to form a closed-circuit calibrator. When the second contact portion 702 moves upward until the preset marking line 704 on the movable rear plug 7 is seen, the outer conductor 2 and the inner conductor 3 can be electrically disconnected to form an open-circuit calibrator.

[0042] Embodiment 2:

[0043] like Figures 6 to 8As shown, compared with the first embodiment, the difference is that in this embodiment, the outer shell 1 and the main body of the movable rear plug 7 are made of plastic, and the movable rear plug 7 is threadedly installed in the movable chamber 104, while the first contact part 701 and the second contact part 702 in the first embodiment are a whole in this embodiment, specifically a circular conductive metal sheet 705, and the conductive metal sheet 705 is fixed on the working end face of the movable rear plug 7 (that is, on the end face in the movable chamber 104). Correspondingly, in addition to the conductive contact 6, the insulating rear plug 5 is also provided with a conductive spring 8, and the conductive contact 6 and the conductive spring 8 are integrally formed on the insulating rear plug 5 by an insert injection molding process. The conductive spring piece 8 is formed by bending an elastic metal sheet in one piece, and includes a first elastic contact 801 and a second elastic contact 802. The first elastic contact 801 is exposed on the outer end surface of the insulating rear plug 5 and is used to elastically abut against the conductive metal sheet 705. The second elastic contact 802 is located at the side of the insulating rear plug 5 and is used to elastically abut against the outer conductor 2. Similarly, when working, it is only necessary to rotate the movable rear plug 7 to connect or disconnect the conductive contact 6 and the conductive spring piece 8 through the conductive metal sheet 705, so as to realize free switching between the open circuit and the short circuit.

[0044] Embodiment three:

[0045] like Figures 9 to 12 As shown, compared with the second embodiment, the difference is that in this embodiment, there is no thread on the outer wall of the movable rear plug 7 and the inner wall of the movable chamber 104, and the movable rear plug 7 is coaxially slidably installed in the movable chamber 104. In order to conveniently control the on and off of the inner conductor 3 and the outer conductor 2, an L-shaped limiting hole 105 is opened on the side wall of the movable chamber 104, and the limiting hole 105 includes a locking groove opened in the circumferential direction and a movable groove opened in the axial direction. Correspondingly, a limiting pin 706 is radially arranged on the side wall of the movable rear plug 7, and the limiting pin 706 is detachably fixed on the side wall of the movable rear plug 7 and can slide along the limiting hole 105. In addition, a compression spring 9 is also arranged between the movable rear plug 7 and the movable chamber 104. When short circuit detection is required, it is only necessary to push the movable rear plug 7 downward to the lowest end, and then rotate the movable rear plug 7 so that the limit pin 706 is stuck in the locking groove and remains locked. At this time, the conductive metal sheet 705 is in contact with the conductive contact 6 and the conductive spring 8 at the same time, and the outer conductor 2 is electrically connected with the inner conductor 3 to form a closed circuit calibrator. When open circuit monitoring is required, it is only necessary to rotate the conductive rear plug so that the limit pin 706 is disengaged from the locking groove, and then the conductive rear plug will automatically slide upward to a limited position under the elastic force of the compression spring 9, so that the outer conductor 2 is electrically disconnected from the inner conductor 3 to form an open circuit calibrator.

[0046] The test probe calibrator provided by the utility model can switch freely between an open circuit calibrator and a short circuit calibrator, and calculates the absolute value of the transmission scattering parameter S21 of the board-to-board test probe through open circuit and short circuit measurements, and determines the loss of the path where the board-to-board test probe is located by combining the two measurement information. It is worth mentioning that by combining multiple open circuit testers or short circuit testers side by side to form an open circuit array or a short circuit array, the purpose of multiple calibrations can be achieved through one connection through channel switching.

[0047] The above-mentioned embodiments only express the implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A calibrator for a board-to-board test probe, characterized in that: include: An external shell having an installation chamber (101) and an activity chamber (104) disposed therein; A test assembly, comprising a hollow outer conductor (2), at least one inner conductor (3) arranged inside the outer conductor (2) parallel to the axis of the outer conductor (2), and an insulating medium (4) arranged between the two conductors to hold the two conductors against each other; wherein the mounting portion (201) of the outer conductor (2) is embedded in the mounting chamber (101); the mating portion (202) of the outer conductor (2) is exposed outside the outer housing (1) and is adapted to the shape of the connector to be tested; A movable rear plug (7) is movably mounted in the movable chamber (104), comprising a first contact portion (701) capable of electrically contacting the outer conductor (2) and a second contact portion (702) capable of electrically contacting the inner conductor (3), wherein the first contact portion (701) is electrically connected to the second contact portion (702).

2. A calibrator for a board-to-board test probe according to claim 1, characterized in that: It also includes an insulating back plug (5) arranged at the end of the mounting portion (201) of the outer conductor (2) for limiting the position of the inner conductor (3), and the insulating back plug (5) is provided with a conductive contact (6) electrically connected to the inner conductor (3) and protruding toward the active chamber (104).

3. A calibrator for a board-to-board test probe according to claim 2, characterized in that: The outer shell (1) and the movable rear plug (7) are both made of metal material. The movable rear plug (7) is threadedly installed in the movable chamber (104). The first contact portion (701) is the threaded surface of the movable rear plug (7), and the second contact portion (702) is the end surface of the movable rear plug (7) located in the movable chamber (104).

4. The calibrator for a board-to-board test probe according to claim 2, characterized in that: The outer shell (1) and the main body of the movable rear plug (7) are both made of insulating materials. The movable rear plug (7) is threadedly installed in the movable chamber (104). The first contact portion (701) and the second contact portion (702) are conductive metal sheets (705) arranged on the end surface of the working end of the movable rear plug (7).

5. The calibrator for a board-to-board test probe according to claim 2, characterized in that: The outer shell (1) and the main body of the movable rear plug (7) are both made of plastic. The movable rear plug (7) is slidably installed in the movable chamber (104). A limiting hole (105) for controlling the position of the movable rear plug (7) is opened on the side wall of the movable chamber (104). A limiting pin (706) that matches the limiting hole (105) is radially arranged on the side wall of the movable rear plug (7).

6. A calibrator for a board-to-board test probe according to claim 4 or 5, characterized in that: The insulating rear plug (5) is fixedly connected to the outer conductor (2) by means of a buckle, the conductive contact (6) and the conductive spring (8) are integrally formed on the insulating rear plug (5) by means of an insert injection molding process, and the first contact portion (701) and the second contact portion (702) are conductive metal sheets (705) arranged on the end surface of the working end of the movable rear plug (7).

7. The calibrator for a board-to-board test probe according to claim 1, characterized in that: The inner conductor (3) is a spring probe, comprising a hollow main body (301) and a floating part (302) slidably installed in the main body (301) through a spring.

8. The calibrator for a board-to-board test probe according to claim 7, characterized in that: A limiting slot for controlling the floating height is provided on the outer wall of the floating portion (302). Correspondingly, the insulating medium (4) comprises a first insulator (401). The first insulator (401) is clamped between the floating portion (302) and the outer conductor (2) through the limiting slot. The inner diameter of the first insulator (401) is larger than the outer diameter of the floating portion at the limiting slot, smaller than the outer diameter of the main body (301), and is in contact with the main body (301).

9. A calibrator for a board-to-board test probe according to claim 8, characterized in that: The insulating medium (4) further comprises a second insulator (402) disposed below the first insulator (401); the second insulator (402) is clearance-matched with the floating portion (302) and abuts against a limit ring on the inner wall of the docking portion (202).

10. The calibrator for a board-to-board test probe according to claim 1, characterized in that: A limit platform (203) is also provided between the mounting portion (201) and the docking portion (202) of the outer conductor (2) to ensure the mounting depth of the outer conductor (2), and a fixing base plate (102) is also provided on the outside of the outer shell (1), and fixing holes (103) are provided on the fixing base plate (102) to facilitate assembly and disassembly on a fixture.

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